写作训练
        爸爸 我不要长大 /让我坐在你肩膀 /爸爸 我不想长大 /不要看见你白发/爸爸 我不要长大/快快变你熟悉的魔法/爸爸 我不要长大/不想 永远都不想……——陈楚生的歌《不想长大》道出了成长期少年的心声。我们都会慢慢长大，挥别孩提时代。对于成长，我们万分期待，可真地长大了，又会有些害怕……
        请以“不想长大”为题，写一篇文章。
        要求：①全文不少于500字；②书写正确、规范、美观。

生产上培育无子番茄、青霉素高产菌株、杂交培育矮秆抗锈病小麦、抗虫棉的培育原理依次是(    )
①生长素促进果实发育 ②染色体变异 ③基因重组④基因突变⑤基因工程

    Around twenty years ago I was living in York. 1 I had a lot of experience and a Master's degree,I could not find 2 work.

    I was 3 a school bus to make ends meet and 4 with a friend of mine, for I had lost my flat. I had 5 five interviews(面试) with a company and one day between bus runs they called to say I did not 6 the job. “Why has my life become so  7？”I thought painfully.

    As I pulled the bus over to  8  a little girl, she handed me an earring  9 I should keep it  10  somebody claimed (认领) it. The earring was painted black and said “BE HAPPY”.

    At first I got angry. Then it  11 me—I had been giving all of my 12  to what was going wrong with my 13  rather than what was right！I decided then and there to make a 14 of fifty things I was happy with. Later, I decided to15 more things to the list.That night there was a phone call for  16  from a lady who was a director at a large  17.She asked me if I would  18  a one­day lecture on stress(压力) management to 200 medical workers. I said yes.

    My 19  there went very well, and before long I got a well­paid job.To this day I know it was because I changed my way of  20  that I completely changed my life.

⑴棱长为2的正方体    ⑵底面直径和高均为2的圆柱        ⑶底面直径和高

均为2的圆锥